An alternating current. I Amperes, is given by i = 10sin2πft. where f is the frequency in Hertz and t the time in seconds. What is the rate of change of current when t = 20ms given that f = 150 Hz​

The monthly texting plan of all star cell is $11 per month and $0.25 per text. the monthly texting plan of top line cell is $14 per month and $0.15 per text. a student wants to set up a system of equations to find the number of texts for which the total monthly cost of the two companies is the same. he uses the variables x and y. he lets y represent the total monthly cost. what will x represent? x = number of texts x = cost of the total number of texts x = total monthly cost x = cost of each text